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A 10 ha site is scheduled for re-development into a low density residential housing estate. The area is currently turfed. Soil tests on samples reveal that the soil on average contains 25% clay, 10% silt, the rest, sand and 0.5% organic matter. The flow length is estimated to be 200m with an average slope of 2.5%. Erosion control practice limits erosion from 30% of the surface area only (ie no erosion occurs from 70% of the surface), and erodible areas are well compacted. Assuming that the specific energy proposed by Wischmeier and Smith (1974) is applicable, for the construction phase:
(i) Plot the pollutograph of solids runoff from the site and estimate the maximum solids concentration (g/L) for runoff from the site.
(ii) Estimate total mass of solids (kg) mobilised from the site during and after construction for the same storm event
What is the direction of the first ball after the collision? obtain the direction as an angle south of east.
The model airplane in Figure 5.7 is flying at a speed of 14.4 m/s on a horizontal circle of radius 17.2 m. The mass of the plane is 1.19 kg. What is the net work done on the plane
A volley ball is spiked so that it has an initial velocity of 17 m/s directed downward at an angle of 65° below the horizontal. What is the horizontal component of the ball's velocity when the opposing player fields the ball?
A prospector finds a solid rock composed of granite (? = 2650 kg/m3) and gold. What percentage of the rock is gold by volume
Light visible to humans consists of electromagnetic waves with wavelengths (in air) in the range 400-700 nm (4.0 10-7 m to 7.0 10-7 m). What are the frequencies of electromagnetic waves that are visible
Consider the transitions 3d -->2p in hydrogen. Calculate the possible energies of emitted photons, taking into account the spin-orbital interaction. How many photon lines are there? Please show formulas and explain clearly
A 300 g object attached to the end of a spring oscillates with an amplitude of 7 cm and a frequency of 1.80 Hz. Find its maximum speed and maximum acceleration
A parallel-plate capacitor carries a constant charge Q (i.e., +Q on one plate, and -Q on the other). When a dielectric is inserted between the plates, what happens to the charge on the plates
question1a student who weighs 490 n is wearing a backpack that weighs 88 n. the student is standing still on level
An 108 millimeter focal length lens is used to focus an image on the sensor of a camera. The maximum distance allowed between the lens and the sensor plane is 134 millimeter. Find the closest object this lens could photograph sharply
The Earth orbits the Sun once per year. What is the centripetal force keeping the Earth in orbit
What is the vertical force on the support closest to piano.
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